Clustered Base Station Power Coordination for Interference Management
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Solution Overview
Problem
Current multi-cell wireless communication systems face challenges in achieving fair and high throughput for all users, particularly edge users, due to interference and scalability issues in MIMO transmission, where existing methods either suffer from interference limitations or become impractical with increased complexity.
Innovation Solution
The method involves varying transmit power patterns across base stations in clusters, coordinating power levels across virtual channels, and scheduling users to optimize performance, allowing for coordinated multi-user MIMO deployments with scalable and fair edge throughput without excessive complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fully coordinated multicell deployments are used to eliminate interference and achieve high sum-throughput, then throughput is improved, but device complexity and system scalability deteriorate due to the need to coordinate all transmit antennas across all cells
Solution Approach 1:
The patent divides the network into multiple independent clusters, where each cluster coordinates its transmit antennas and power levels autonomously. This segmentation allows each cluster to achieve coordinated benefits without requiring global coordination across all cells, thereby reducing overall system complexity while maintaining high throughput within each cluster.
Solution Approach 2:
The patent introduces dynamic power coordination patterns that vary across clusters and time. Each cluster can adapt its power levels and coordination strategies dynamically based on local conditions, enabling flexible resource allocation that maintains high throughput while avoiding the rigidity and complexity of static global coordination schemes.
2Productivity
If transmit power is increased to improve edge user throughput, then edge throughput is improved, but interference to other users increases and scalability deteriorates
Solution Approach 1:
The patent applies different power levels to different spatial locations and user groups within each cluster. Edge users receive higher power allocations from their serving cluster while experiencing reduced interference from other clusters due to coordinated power patterns. This local quality differentiation allows edge throughput improvement without proportionally increasing overall interference.
Solution Approach 2:
The patent employs periodic variation of power coordination patterns across clusters. By cycling through different power allocation patterns over time, the system ensures that no single cluster consistently transmits at maximum power, thereby reducing average interference levels while maintaining high edge throughput through periodic high-power transmission windows.
3Productivity
If MIMO transmission is used to increase data rate, then throughput is improved, but system complexity increases due to the need for multiple transmit and receive antennas
Solution Approach 1:
The patent segments the MIMO transmission into cluster-level coordination, where each cluster manages its own set of transmit antennas independently. This allows MIMO benefits to be achieved within each cluster without requiring complex coordination across all antennas in the entire network, thereby reducing overall system complexity while maintaining high data rates.
Data Source
AI summary
A method and apparatus is disclosed herein for varying transmit power patterns in a multi-cell wireless transmission environment. In one embodiment, the method comprises varying transmit power coordination patterns for base stations in the wireless communication system to jointly vary base station power over a set of virtual channels over base stations within a cluster and across clusters of base stations; and jointly transmitting by groups of the base stations to one or more user terminals in their respective clusters based on the transmit power coordination patterns.